Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais anos a revista Vaillant e Pif estiveram em circulação?
 ###Tabelas: CREATE TABLE bibliography (bibliography_id AUTO_INCREMENT PRIMARY KEY, Series VARCHAR, Years VARCHAR, Magazine VARCHAR, Albums VARCHAR, Editor VARCHAR) CREATE TABLE biggest_wins (biggest_wins_id AUTO_INCREMENT PRIMARY KEY, Margin INT, Score VARCHAR, Opponent VARCHAR, Venue VARCHAR, Date VARCHAR) CREATE TABLE siena_college_research_institute_survey (siena_college_research_institute_survey_id AUTO_INCREMENT PRIMARY KEY, Seq. VARCHAR, Name VARCHAR, Background INT, Party Leadership INT, Communication Ability INT, Relations with Congress INT, Court Appointments INT, Handling of Economy INT, Luck INT, Ability to Compromise INT, Willing to take Risks INT, Executive Appointments INT, Overall Ability INT, Imagination INT, Domestic Accomplishments INT, Integrity INT, Executive Ability INT, Foreign Policy Accomplishments INT, Leadership Ability INT, Intelligence INT, Avoid Crucial Mistakes INT, Expert's View INT, Overall INT) CREATE TABLE challengers_and_futures_17 (challengers_and_futures_17_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score VARCHAR) CREATE TABLE duration (duration_id AUTO_INCREMENT PRIMARY KEY, Term Abroad VARCHAR, 2000/01 INT, 2001/02 INT, 2002/03 INT, 2003/04 INT, 2004/05 INT, 2005/06 INT, 2006/07 INT, 2007/08 INT, 2008/09 INT)  
SELECT Years FROM bibliography WHERE Magazine = vaillant and pif